Will the leaves turn green after the yellow spot disease is controlled?

1. Insist on increasing the application of organic fertilizer to fundamentally enhance the disease resistance of the tree itself;

2. Insist on doing a good job of clearing the garden in winter, collect diseased branches, residual leaves, and fallen fruits, and burn them or bury them deeply, so as to minimize the source of diseases in the orchard;

3. After the spring shoot leaves and when the flowers reach 2 3, spray the prevention as soon as possible, and then basically spray once every 30 days.

4. Selected and alternately used drugs: 70% thiophanate-methyl or 60% multi-fu wettable powder 800 times, 70% mancozeb wettable powder 500 times, 77% copper hydroxide wettable powder 500 times, etc.

Growth habit 1, growth and development, flowering and fruiting and temperature, sunshine, moisture (humidity), soil, wind, altitude, topography and slope direction and other environmental conditions.

Sand tangerines are closely related, and these conditions have the greatest impact on several temperatures. Even the difference in temperature sometimes has very different results.

2. The temperature required for the growth and development of sugar oranges. Flower bud differentiation in autumn requires a diurnal temperature of about 20 and 10 respectively, and the soil temperature for root growth is about the same as that of the aboveground part. Too low temperature will cause sugar oranges to freeze, sweet orange-4, Wenzhou mandarin -5 will cause branches and leaves to freeze, sweet orange -5 below, Wenzhou mandarin -6 below will frostbite large branches and branches, sweet orange below, Wenzhou mandarin -9 below will make the plant freeze to death.

Two-year-old sand sugar orange leaves yellow.

There are a number of reasons for the yellowing of the crown leaves of the sugar orange fruit tree.

1. The soil water content is too sufficient for a long time, resulting in the soil oxygen content being too small, resulting in root weakness or a large number of suffocation and death, unable to absorb water from the soil normally, nutrients to support the growth and consumption of the upper part of the plant, resulting in rapid hydrolysis of leaf chlorophyll, green and yellowing;

2. The water content of the soil is too small, resulting in malnutrition of the plants and a large number of yellowing of the leaves;

3. The harm of foot rot causes the carbohydrate organic nutrients produced by the leaves of the plant to be unable to be transported to the root system, and the root system is weakened when the above nutrients are lacking, and it is difficult to absorb nutrients normally and transport them to the upper part, resulting in the lack of nutrients and water and yellowing of the shoot leaves;

4. For plants with average tree potential.

Summary. According to your question, mine is: I recommend that you use 85% gibberellin crystals to 120 catties of water, and add 60 ml of Nongfeng Brassinolide and 120 ml of high-potassium Kangbao or Nongfu Kang foliar fertilizer to the dilution, and spray it once every 10 days or so.

Gibberellin and brassinolide were used to inhibit the synthesis of abscisic acid from the fruit pedicle and the fruit stalk of young fruits. Agrosin brassinolide was used to improve the stress resistance of plants, and foliar fertilizer was used to supplement the nutrients of the tree body to promote the green transformation of young fruits.

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According to your question, the spring of my socks is: Causes: 1. Iron deficiency. Because it prefers slightly acidic soils, it is necessary to combine topdressing with ferrous sulfate. 2. The degree of temperature tremor is low. 3. There are too many results and nutrients are exhausted.

What fertilizer to use. According to your question, mine is: Fu Lu recommends that you use 85% gibberellin crystals to 120 catties of water, and add 60 ml of Nongfeng Brassinolide and 120 ml of high-potassium Kangbao or Nongfu Kang foliar fertilizer to the dilution, and spray it once every 10 days.

Gibberellin and brassinolide were used to inhibit the synthesis of abscisic acid from the fruit pedicle and the fruit stalk of Limb Mountain. Agrosin brassinolide was used to improve the stress resistance of plants, and foliar fertilizer was used to supplement the nutrients of the tree body to promote the green transformation of young fruits.

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Summary. If the tree is deficient in nitrogen, it is generally the old leaves that are the first to yellow, the new leaves are pale yellow or pale green at first, and finally the leaves are fully yellow. In general, there is no nitrogen deficiency.

Phosphorus deficiency yellowing. Citrus phosphorus deficiency is manifested by poor gloss of old leaves, yellow or coppery yellow leaf color, leaf edges begin to scorch, and new leaves are narrow and the number of leaves is small.

What's the matter with the yellowing of the old leaves of sugar oranges?

Potassium deficiency yellowing. The leaf tips of the old citrus leaves are yellowed, and the leaves begin to curl, and with the severe yellowing, the leaf tips are necrotic, and there are fewer new shoots, and they will gradually wither and yellow.

What's the matter with the yellowing of the old leaves of sugar oranges?

Magnesium deficiency yellowing. It mainly occurs in the old leaves of the tree, and the symptoms are yellow spots on the leaf surface, and finally only the base of the leaf is green, and even curly, showing an inverted V-shaped style.

What's the matter with the yellowing of the old leaves of sugar oranges?

Conclusion. For the appearance of this yellowing, generally related to the lack of soil and tree nutrition, especially the lack of a large number of elements, which may be related to no fertilization in winter, we recommend that when fertilizing in winter, we must bury some compound fertilizer and trace element fertilizer, the tree body with these symptoms, it is recommended to spray the corresponding nutrients in time, in addition, citrus yellowing is mostly related to the poor root system of citrus, for this situation, it is more urgent to improve the root system, it is recommended to repair the root system by spraying the sea elf root type, and supplement the essential nutrients, On the basis of good root system, the soil environment and tree nutrient status should be further improved.

How do the leaves of the sugar orange tree turn yellow?

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If the tree is deficient in nitrogen, it is generally the old leaves that are the first to yellow, the new leaves are pale yellow or pale green at first, and finally the leaves are fully yellow. In general, there is no nitrogen deficiency. Phosphorus deficiency yellowing is manifested by poor gloss of old leaves, yellowing or coppery yellow, leaf edges beginning to be scorched, and new leaves are narrow and small.

What's the matter with the yellowing of the old leaves of sugar oranges? Potassium deficiency yellowing of old citrus leaves yellowing, leaves begin to curl, with serious yellowing, leaf tip necrosis, fewer new shoots, will gradually yellow. What's the matter with the yellowing of the old leaves of sugar oranges?

Magnesium deficiency yellowing mainly occurs in the old leaves of the tree, and the symptoms are yellow spots on the leaf surface, and finally only the base of the leaves is green, and even curly, showing an inverted V-shaped style. What's the matter with the yellowing of the old leaves of sugar oranges? Conclusion for the appearance of this yellowing, generally related to the lack of soil and tree nutrition, especially the lack of a large number of elements, which may be related to the lack of fertilization in winter, we recommend that when fertilizing in winter, we must bury some compound imitation cultivation of Hefei and trace element fertilizer, the appearance of these symptoms of the tree, it is recommended to spray the corresponding nutrients in time, in addition, citrus silver only yellowing is mostly related to the poor root system of citrus, for this situation, it is more urgent to improve the root system, it is recommended to apply the sea elf root type and other repair roots, Supplement essential nutrients, and on the basis of good root system, further improve the soil environment and the nutritional status of the tree.

Clan. The leaves of the fruit tree turn yellow.

Pro, lack of chemical elements, nitrogen and phosphorus.

All of them can cause the leaves of fruit trees to turn yellow.

Tangerine is a common fruit tree, its fruit is sweet and sour, and it is deeply loved by people. However, if the tangerine turns yellow after growing leaves, it means that there is some problem with it, and it needs to be treated in time, otherwise it may die.

First of all, the yellowing of tangerines after growing leaves may be due to insufficient soil nutrients. If there are not enough nutrients in the soil, it will cause the tangerine to not absorb enough nutrients, which will affect its growth and development. At this point, we can solve this problem by fertilizing.

When fertilizing, you should choose a fertilizer suitable for the growth of sugar oranges, and follow the instructions to fertilize the tangerines to ensure that the sugar oranges can get enough nutrients.

Secondly, the yellowing of tangerines after growing leaves may be due to the invasion of pests and diseases. If there are yellow spots, brown spots, black spots and other disease spots on the leaves, or there are aphids, whiteflies and other pests on the leaves, it means that the sugar orange has been attacked by pests and diseases. At this time, we should take timely measures to carry out pest control.

Suitable pesticides can be selected for spraying, or biological control methods such as the introduction of natural enemies can be used.

Finally, the yellowing of tangerines after growing leaves may be due to the influence of environmental factors. If the tangerine grows in too cold or too hot environment, or if it is exposed to excessive sun or rain, it will cause its leaves to turn yellow. At this time, we should take corresponding measures, such as moving the position of the sugar orange, shading the sun and rain, etc., to ensure the suitability of its growing environment.

In conclusion, the yellowing of tangerines after growing leaves may be due to a variety of reasons, and corresponding measures need to be taken according to the specific situation. Only by discovering the problem in time and taking measures can the lack of cavity ensure the healthy growth and harvest of sugar oranges.

Causes: 1. Iron deficiency. Because it prefers slightly acidic soils, it is necessary to combine topdressing with ferrous sulfate. 2. The temperature is low. 3. There are too many results and nutrients are exhausted. Compare the above three items, find out the main problem, and prescribe the right medicine - method.

There are many reasons for this yellow leaf! Such as nitrogen deficiency fertilizer, disease, etc. Let's take a look at the root rot.

The root rot of citrus fruit trees such as sugar oranges will cause yellow leaves, weak shoots, and defoliation. The yellow leaves, weak shoots, and fallen leaves cause root rot in many ways. For example, infectious pathogens cause root rot; Root rot occurs due to long-term soil water content, low oxygen content, and root suffocation. Root rot occurs due to the application of too much chemical fertilizer or organic fertilizer, and the applied organic fertilizer is not fully decomposed and burns the root system; Underground pests in the soil cause wounds in the root system and cause pathogens to invade from the wounds; root rot caused by foot rot, etc.

Therefore, to solve the problem of root rot, it is necessary to investigate the above factors and find out the real causes of root rot, so as to implement effective methods for targeted prevention and control of root rot. It is suggested that if the soil water content is too sufficient for a long time (such as in an orchard converted from a former paddy field), the drainage and irrigation ditch should be dug deeply, so that the water level of the drainage and irrigation ditch is more than 80 cm from the ground expression; If after excluding a variety of reasons, it is considered that the root rot of the plant is caused by infectious pathogens, 500 times of 50% dixone wettable powder, or 600 times of 30% oxanine water agent can be used to irrigate the roots, which can kill the diseased bacteria in the invading root system.

In addition, to spray foliar fertilizer on the crown every about 15 days, 60 ml of nongfeng brassinolide can be used, 120 ml of humic acid Kangbao 60 kg of water can be added, and the resistance to disease and other stresses of the plant can be improved with nongfeng brassinolide and foliar fertilizer, so as to reduce the pressure on the root system to absorb water and nutrients; Prune weak branches and dead branches that are too slender to increase the ventilation and light transmission of the canopy, so that the plants can rejuvenate.

This can happen when there is too much rain and water accumulates, so ditches should be dug and drained. If there is a deficiency of trace elements potassium and calcium, this can also occur, and fertilizers containing potassium and calcium should be applied appropriately.